Temporal focusing-based multiphoton excitation microscopy via digital micromirror device

Area of Science:

• Microscopy and Imaging Technologies
• Optical Physics
• Biomedical Engineering

Background:

• Conventional multiphoton excitation (MPE) microscopy relies on diffraction gratings for temporal focusing.
• Limitations exist in the flexibility and precise control offered by traditional grating-based systems.

Purpose of the Study:

• To present an enhanced temporal focusing-based MPE microscope.
• To replace the conventional diffraction grating with a digital micromirror device (DMD).
• To demonstrate the optical sectioning ability and axial resolution of the DMD-based MPE microscope.

Main Methods:

• Developed an MPE microscope incorporating a digital micromirror device (DMD) for temporal focusing.
• Positioned the DMD on the image-conjugate plane of the objective lens' focal plane.
• Performed experimental imaging of a thin fluorescence film to evaluate performance.

Main Results:

• The DMD effectively diffracts light frequencies for temporal focusing, similar to a grating.
• Achieved an axial resolution of 4.0 μm, comparable to a setup with a 600 lines/mm grating.
• Demonstrated the optical sectioning ability of the proposed DMD-based MPE microscope.

Conclusions:

• The DMD can successfully replace diffraction gratings in temporal focusing-based MPE microscopy.
• The proposed setup offers precise MPE pattern projection onto the focal plane.
• This advancement provides enhanced capabilities for MPE microscopy with improved control and flexibility.